Java 教程日志，用于JButton的代码
本课程的目的是让导师记录他/她的学生。我是GUI的新手，所以我的代码可能不是最好的，但我需要JButton“SAVE”代码的帮助，以获取日志中的所有信息并将其存储在.txt文件中。第374行是我的按钮命令所在的位置Java 教程日志，用于JButton的代码,java,swing,jframe,jpanel,jbutton,Java,Swing,Jframe,Jpanel,Jbutton,本课程的目的是让导师记录他/她的学生。我是GUI的新手，所以我的代码可能不是最好的，但我需要JButton“SAVE”代码的帮助，以获取日志中的所有信息并将其存储在.txt文件中。第374行是我的按钮命令所在的位置 import java.awt.BorderLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;
public class MainGUI extends JFrame {
// Declare variables:
// array lists
String[] columnNames = {"ID", "NAME", "COURSE", "Professor", "Reason for Tutor"};
Object[][] data = new Object[25][5];
// table
JTable table = new JTable(data, columnNames) {
// sets the ability of the cells to be edited by the user
@Override
public boolean isCellEditable(int row, int column) {
return false; // returns false, cannot be edited
}
};
// frames
JFrame frame, frame1;
// panels
JPanel buttonPanel, buttonPanel2, tablePanel, addPanel, editPanel;
// labels
JLabel labelID, labelName, labelCourse, labelProfessor, labelHelp;
// text fields
JTextField txtID, txtName, txtCourse, txtProfessor, txtHelp;
// buttons
JButton btnAdd, btnEdit, btnDelete, btnSort, btnSave, btnAddInput, btnCancel;
// additionals
int keyCode, rowIndex, rowNumber, noOfStudents;
// button handler
MainGUI.ButtonHandler bh = new MainGUI.ButtonHandler();
public MainGUI() {
// setting/modifying table components
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
table.getSelectionModel().addListSelectionListener(new MainGUI.RowListener());
table.getColumnModel().getColumn(1).setPreferredWidth(200);
table.getColumnModel().getColumn(3).setPreferredWidth(100);
table.getColumnModel().getColumn(4).setPreferredWidth(200);
table.getTableHeader().setResizingAllowed(false);
table.getTableHeader().setReorderingAllowed(false);
JScrollPane scrollPane = new JScrollPane(table);
// main buttons
btnAdd = new JButton("ADD");
btnAdd.addActionListener(bh);
btnEdit = new JButton("EDIT");
btnEdit.addActionListener(bh);
btnEdit.setEnabled(false); // disables the component
btnDelete = new JButton("DELETE");
btnDelete.addActionListener(bh);
btnDelete.setEnabled(false); // disables the component
btnSort = new JButton("SORT");
btnSort.addActionListener(bh);
btnSave = new JButton("SAVE");
btnSave.addActionListener(bh);
btnSave.setActionCommand("Save");
// with button Listeners
// sub buttons
btnAddInput = new JButton("Add");
btnAddInput.addActionListener(bh);
btnAddInput.setActionCommand("AddInput");
btnCancel = new JButton("Cancel");
btnCancel.addActionListener(bh);
// set label names
labelID = new JLabel("ID");
labelName = new JLabel("NAME");
labelCourse = new JLabel("COURSE");
labelProfessor = new JLabel("Professor");
labelHelp = new JLabel("Reason for Tutoring");
// set text fields width
txtID = new JTextField(20);
txtName = new JTextField(20);
txtCourse = new JTextField(20);
txtProfessor = new JTextField(20);
txtHelp = new JTextField(20);
txtID.setDocument(new MainGUI.JTextFieldLimit(15)); // limits the length of input:
// max of 15
txtID.addKeyListener(keyListener); // accepts only numerals
// main frame
// panel for the table
tablePanel = new JPanel();
tablePanel.setLayout(new BoxLayout(tablePanel, BoxLayout.PAGE_AXIS));
tablePanel.setBorder(BorderFactory.createEmptyBorder(10, 2, 0, 10));
tablePanel.add(table.getTableHeader());
tablePanel.add(table);
// panel for the main buttons
buttonPanel = new JPanel();
buttonPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
// positions the main buttons
c.gridx = 0;
c.gridy = 0;
c.ipady = 20;
c.insets = new Insets(10, 10, 10, 10);
c.fill = GridBagConstraints.HORIZONTAL;
buttonPanel.add(btnAdd, c);
c.gridx = 0;
c.gridy = 1;
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 20;
c.insets = new Insets(10, 10, 10, 10);
buttonPanel.add(btnEdit, c);
c.gridx = 0;
c.gridy = 2;
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 20;
c.insets = new Insets(10, 10, 10, 10);
buttonPanel.add(btnDelete, c);
c.gridx = 0;
c.gridy = 3;
c.ipady = 20;
c.insets = new Insets(10, 10, 10, 10);
c.fill = GridBagConstraints.HORIZONTAL;
buttonPanel.add(btnSort, c);
c.gridx = 0;
c.gridy = 4;
c.ipady = 20;
c.insets = new Insets(10, 10, 10, 10);
c.fill = GridBagConstraints.HORIZONTAL;
buttonPanel.add(btnSave, c);
frame = new JFrame("Student Database");
frame.setVisible(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.add(tablePanel, BorderLayout.CENTER);
frame.add(buttonPanel, BorderLayout.EAST);
frame.pack();
// ADD frame
// panel for adding
addPanel = new JPanel();
addPanel.setLayout(new GridBagLayout());
// positions the components for adding
// labels
c.insets = new Insets(1, 0, 1, 1);
c.gridx = 0;
c.gridy = 0;
addPanel.add(labelID, c);
c.gridy = 1;
addPanel.add(labelName, c);
c.gridy = 2;
addPanel.add(labelCourse, c);
c.gridy = 3;
addPanel.add(labelProfessor, c);
c.gridy = 4;
addPanel.add(labelHelp, c);
// text fields
c.gridx = 1;
c.gridy = 0;
c.ipady = 1;
addPanel.add(txtID, c);
c.gridy = 1;
c.ipady = 1;
addPanel.add(txtName, c);
c.gridy = 2;
c.ipady = 1;
addPanel.add(txtCourse, c);
c.gridy = 3;
c.ipady = 1;
addPanel.add(txtProfessor, c);
c.gridy = 4;
c.ipady = 1;
addPanel.add(txtHelp, c);
// panel for other necessary buttons
buttonPanel2 = new JPanel();
buttonPanel2.setLayout(new GridLayout(1, 1));
buttonPanel2.add(btnAddInput);
buttonPanel2.add(btnCancel);
frame1 = new JFrame("Student Database");
frame1.setVisible(false);
frame1.setResizable(false);
frame1.setDefaultCloseOperation(HIDE_ON_CLOSE);
frame1.add(addPanel, BorderLayout.CENTER);
frame1.add(buttonPanel2, BorderLayout.PAGE_END);
frame1.pack();
}// end
KeyListener keyListener = new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
keyCode = e.getKeyCode();
if (!(keyCode >= 48 && keyCode <= 57) && !(keyCode >= 96 && keyCode <= 105)
&& !(keyCode >= 37 && keyCode <= 40) && !(keyCode == 127 || keyCode == 8)) {
txtID.setEditable(false);
}
}
@Override
public void keyReleased(KeyEvent e) {
txtID.setEditable(true);
}
};
class RowListener implements ListSelectionListener {
@Override
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
rowIndex = table.getSelectedRow();
if (data[rowIndex][0] == null || data[rowIndex][0] == "") {
btnEdit.setEnabled(false);
btnDelete.setEnabled(false);
} else {
btnEdit.setEnabled(true);
btnDelete.setEnabled(true);
}
}
}
}// end
class ButtonHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("ADD")) {
// text fields for Student input data
txtID.setText("");
txtName.setText("");
txtCourse.setText("");
txtProfessor.setText("");
txtHelp.setText("");
frame1.setTitle("Add Student data"); // title bar name for add
frame1.setVisible(true);
} else if (e.getActionCommand().equals("EDIT")) {
txtID.setText(data[rowIndex][0] + ""); // will preview the ID
// input during Add
txtName.setText(data[rowIndex][1] + ""); // will preview the Name
// input during Add
txtCourse.setText(data[rowIndex][2] + ""); // will preview the
// Course input during
// Add
txtProfessor.setText(data[rowIndex][3] + ""); // will preview the Year
// input during Add
txtHelp.setText(data[rowIndex][4] + ""); // will preview the
// Gender input during
// Add
txtID.setEditable(false); // forbids the user to edit the entered
// ID number
frame1.setTitle("Edit Student data"); // title bar name for edit
btnAddInput.setActionCommand("Edit2");
btnAddInput.setText("ACCEPT");
frame1.setVisible(true); // sets the visibility of frame1
} else if (e.getActionCommand().equals("DELETE")) {
int confirm = JOptionPane.showConfirmDialog(frame, "ARE YOU SURE?", "CONFIRM",
JOptionPane.YES_NO_OPTION);
if (confirm == 0) {
rowIndex = table.getSelectedRow();
rowNumber = 0;
noOfStudents--;
for (int i = 0; i <= 10; i++) {
if (rowIndex != i && i <= noOfStudents) {
data[rowNumber][0] = data[i][0];
data[rowNumber][1] = data[i][1];
data[rowNumber][2] = data[i][2];
data[rowNumber][3] = data[i][3];
data[rowNumber][4] = data[i][4];
rowNumber++;
} else if (rowIndex != i && i > noOfStudents) {
data[rowNumber][0] = "";
data[rowNumber][1] = "";
data[rowNumber][2] = "";
data[rowNumber][3] = "";
data[rowNumber][4] = "";
rowNumber++;
}
}
if (noOfStudents == 1000) {
btnAdd.setEnabled(false);
}
else {
btnAdd.setEnabled(true);
}
if (noOfStudents == 0) {
btnDelete.setEnabled(false);
btnEdit.setEnabled(false);
} else {
btnDelete.setEnabled(true);
btnEdit.setEnabled(true);
}
rowIndex = table.getSelectedRow();
if (data[rowIndex][0] == null || data[rowIndex][0] == "") {
btnEdit.setEnabled(false);
btnDelete.setEnabled(false);
} else {
btnEdit.setEnabled(true);
btnDelete.setEnabled(true);
}
table.updateUI();
}
} else if (e.getActionCommand().equals("AddInput")) {
if (txtID.getText().isEmpty() || txtName.getText().isEmpty()
|| txtCourse.getText().isEmpty()// /
|| txtProfessor.getText().isEmpty() || txtHelp.getText().isEmpty()) {
JOptionPane.showMessageDialog(null, "PLEASE FILL IN THE BLANKS.", "ERROR!",
JOptionPane.ERROR_MESSAGE);
}
else {
int dup = 0;
for (int i = 0; i < 10; i++) {
if (txtID.getText().equals(data[i][0])) {
JOptionPane.showMessageDialog(null, "ID NUMBER ALREADY EXISTS.", "ERROR!",
JOptionPane.ERROR_MESSAGE);
dup++;
}
}
if (dup == 0) {
rowIndex = table.getSelectedRow();
data[noOfStudents][0] = txtID.getText();
data[noOfStudents][1] = txtName.getText();
data[noOfStudents][2] = txtCourse.getText();
data[noOfStudents][3] = txtProfessor.getText();
data[noOfStudents][4] = txtHelp.getText();
table.updateUI();
frame1.dispose();
noOfStudents++;
if (noOfStudents == 50){
btnAdd.setEnabled(false);
}
else {
btnAdd.setEnabled(true);
}
if (data[rowIndex][0] == null) {
btnEdit.setEnabled(false);
btnDelete.setEnabled(false);
} else {
btnEdit.setEnabled(true);
btnDelete.setEnabled(true);
}
}
}
table.updateUI();
}else if(e.getActionCommand().equals("Save")){
try {
PrintWriter out = new PrintWriter("filename.txt");
out.println(txtID.getText());
out.println(txtName.getText());
out.println(txtCourse.getText());
out.println(txtProfessor.getText());
out.println(txtHelp.getText());
} catch (FileNotFoundException ex) {
}
}else if (e.getActionCommand().equals("Edit2")) {
if (txtID.getText().isEmpty() || txtName.getText().isEmpty()
|| txtCourse.getText().isEmpty() || txtProfessor.getText().isEmpty()
|| txtHelp.getText().isEmpty()) {
JOptionPane.showMessageDialog(null, "INCOMPLETE INPUT.", "ERROR!",
JOptionPane.ERROR_MESSAGE);
} else {
data[rowIndex][0] = txtID.getText();
data[rowIndex][1] = txtName.getText();
data[rowIndex][2] = txtCourse.getText();
data[rowIndex][3] = txtProfessor.getText();
data[rowIndex][4] = txtHelp.getText();
frame1.dispose();
}
table.updateUI();
} else if (e.getActionCommand().equals("Cancel")) {
frame1.dispose();
}
}
}// end
class JTextFieldLimit extends PlainDocument {
private int limit;
JTextFieldLimit(int limit) {
super();
this.limit = limit;
}
JTextFieldLimit(int limit, boolean upper) {
super();
this.limit = limit;
}
@Override
public void insertString(int offset, String str, AttributeSet attr)
throws BadLocationException {
if (str == null) {
return;
}
if ((getLength() + str.length()) <= limit) {
super.insertString(offset, str, attr);
}
}
}
public static void main(String[] args) {
new MainGUI();
}
}
导入java.awt.BorderLayout；
导入java.awt.GridBagConstraints；
导入java.awt.GridBagLayout；
导入java.awt.GridLayout；
导入java.awt.Insets；
导入java.awt.event.ActionEvent；
导入java.awt.event.ActionListener；
导入java.awt.event.KeyEvent；
导入java.awt.event.KeyListener；
导入java.io.FileNotFoundException；
导入java.io.PrintWriter；
导入javax.swing.*；
导入javax.swing.event.ListSelectionEvent；
导入javax.swing.event.ListSelectionListener；
导入javax.swing.text.AttributeSet；
导入javax.swing.text.BadLocationException；
导入javax.swing.text.PlainDocument；
公共类MainGUI扩展JFrame{
//声明变量：
//数组列表
String[]columnNames={“ID”、“姓名”、“课程”、“教授”、“导师原因”}；
对象[][]数据=新对象[25][5]；
//桌子
JTable table=新的JTable（数据、列名）{
//设置要由用户编辑的单元格的功能
@凌驾
公共布尔值可编辑（int行，int列）{
return false；//返回false，不可编辑
}
};
//框架
JFrame-frame，frame1；
//面板
JPanel buttonPanel、buttonPanel2、tablePanel、addPanel、editPanel；
//标签
JLabel labelID，labelName，labelCourse，labelProfessor，labelHelp；
//文本字段
JTextField txtID，txtName，txtCourse，txtProfessor，txtchelp；
//钮扣
JButton btnAdd、btnEdit、btnDelete、btsensort、btnSave、btnAddInput、btnCancel；
//额外的
int键码、行索引、行编号、noofstudent；
//按钮处理器
MainGUI.ButtonHandler bh=新的MainGUI.ButtonHandler（）；
公共MainGUI（）{
//设置/修改表格组件
表.setSelectionMode（ListSelectionModel.SINGLE_选择）；
table.getSelectionModel（）.addListSelectionListener（新的MainGUI.RowListener（））；
table.getColumnModel（）.getColumn（1）.setPreferredWidth（200）；
table.getColumnModel（）.getColumn（3）.setPreferredWidth（100）；
table.getColumnModel（）.getColumn（4）.setPreferredWidth（200）；
table.getTableHeader（）.SetResizenGallowed（false）；
table.getTableHeader（）.setReorderingAllowed（false）；
JScrollPane scrollPane=新的JScrollPane（表）；
//主按钮
btnAdd=新按钮（“添加”）；
btnAdd.addActionListener（bh）；
btnEdit=新的JButton（“编辑”）；
btnEdit.addActionListener（bh）；
btnEdit.setEnabled（false）；//禁用组件
btnDelete=新的JButton（“删除”）；
btnDelete.addActionListener（bh）；
btnDelete.setEnabled（false）；//禁用组件
btnSort=新的JButton（“排序”）；
bSensor.addActionListener（bh）；
btnSave=新的JButton（“保存”）；
btnSave.addActionListener（bh）；
btnSave.setActionCommand（“保存”）；
//使用按钮侦听器
//子按钮
btnAddInput=新按钮（“添加”）；
btnAddInput.addActionListener（bh）；
btnAddInput.setActionCommand（“AddInput”）；
btnCancel=新的JButton（“取消”）；
btnCancel.addActionListener（bh）；
//设置标签名称
labelID=新的JLabel（“ID”）；
labelName=新的JLabel（“名称”）；
labelCourse=新的JLabel（“课程”）；
labelProfessor=新的JLabel（“教授”）；
labelHelp=new JLabel（“辅导原因”）；
//设置文本字段宽度
txtID=新的JTextField（20）；
txtName=新的JTextField（20）；
txtCourse=新的JTextField（20）；
txtProfessor=新JTextField（20）；
txtHelp=新的JTextField（20）；
txtID.setDocument（新MainGUI.JTextFieldLimit（15））；//限制输入的长度：
//最多15个
addKeyListener（keyListener）；//只接受数字
//主机架
//桌子的面板
tablePanel=新的JPanel（）；
tablePanel.setLayout（新的BoxLayout（tablePanel，BoxLayout.PAGE_轴））；
tablePanel.setBorder（BorderFactory.createEmptyByOrder（10,2,0,10））；
tablePanel.add（table.getTableHeader（））；
tablePanel.add（表）；
//主按钮的面板
buttonPanel=新的JPanel（）；
setLayout（新的GridBagLayout（））；
GridBagConstraints c=新的GridBagConstraints（）；
//定位主按钮
c、 gridx=0；
c、 gridy=0；
c、 ipady=20；
c、 插图=新插图（10,10,10,10）；
c、 填充=GridBagConstraints.HORIZONTAL；
按钮面板添加（btnAdd，c）；
c、 gridx=0；
c、 gridy=1；
c、 填充=GridBagConstraints.HORIZONTAL；
c、 ipady=20；
c、 插图=新插图（10,10,10,10）；
按钮面板添加（btnEdit，c）；
c、 gridx=0；
c、 gridy=2；
c、 填充=GridBagConstraints.HORIZONTAL；
c、 ipady=20；
c、 插图=新插图（10,10,10,10）；
按钮面板添加（btnDelete，c）；
c、 gridx=0；
c、 gridy=3；
c、 ipady=20；
c、 插图=新插图（10,10,10,10）；
c、 填充=GridBagConstraints.HORIZONTAL；
按钮面板添加（b传感器，c）；
c、 gridx=0；
c、 gridy=4；
c、 ipady=20；
c、 插图=新插图（10,10,10,10）；
c、 填充=GridBagConstraints.HORIZONTAL；
按钮面板添加（btnSave，c）；
frame=新JFrame（“学生数据库”）；
frame.setVisible（true）；
frame.setresizeable（false）；
frame.setDefaultCloseOperation（关闭时退出）；
frame.add（tablePanel，BorderLayout.CENTER）；
框架。添加（按钮面板，边框布局。东）；
frame.pack（）；
//添加帧
//用于添加的面板
addPanel=newjpanel（）；
addPanel.setLayout（新的GridBagLayout（））；
//
else if(e.getActionCommand().equals("Save")){
try {
PrintWriter out = new PrintWriter("filename.txt");
out.println(txtID.getText());
out.println(txtName.getText());
out.println(txtCourse.getText());
out.println(txtProfessor.getText());
out.println(txtHelp.getText());
out.flush();
} catch (FileNotFoundException ex) {
}
}
/**
* Prints a String and then terminates the line. This method behaves as
* though it invokes <code>{@link #print(String)}</code> and then
* <code>{@link #println()}</code>.
*
* @param x the <code>String</code> value to be printed
*/
public void println(String x) {
synchronized (lock) {
print(x);
println();
}
}
/**
* Prints a string. If the argument is <code>null</code> then the string
* <code>"null"</code> is printed. Otherwise, the string's characters are
* converted into bytes according to the platform's default character
* encoding, and these bytes are written in exactly the manner of the
* <code>{@link #write(int)}</code> method.
*
* @param s The <code>String</code> to be printed
*/
public void print(String s) {
if (s == null) {
s = "null";
}
write(s);
}